import java.util.Scanner;

public class Text4 {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.println("第一条边的长");
        double a=sc.nextInt();
        System.out.println("第二条边的长");
        double b=sc.nextInt();
        System.out.println("第三条边的长");
        double c=sc.nextInt();
        String x=a*a+b*b==c*c ? "是直角三角形" : "不是直角三角形";
        System.out.println(x);
    }
}
